Mark my words this will happen one day too. A referee will look at an incident inside the box but not give the penalty (which should have been given), the other team break and score straight away. The referee reviews the original incident and awards the penalty and therefore rules out the goal that's just been scored. It will be a circus.
There have been a few occasions even with the use of VAR that debates have continued amongst pundits etc whether it was even the right call.
I just think the whole things a joke and it's for perfectionists.
It's not a joke, it's on the way. And if we play the first round of the League Cup at home (or at a EPL ground), it will be in use. So if I'm going, I'm fully aware that any major decision made is subject to review. Just as it has been at the World Cup.
People have outlined the "mark my words scenario" above. In 61 games at the World Cup, it has not happened. But even if it does, so what. We go back, we check the original incident and if it was wrong, we correct it on the spot, not do nothing and say how unjust it was, 30+ years later. And whoever wins the World Cup will win it by fair means.
When the WBA ko time was confirmed, the club informed fans that VAR would be used. And because it was, we got 2 injustices overturned, that we wouldn't have without it. So the system worked the way it's supposed to work. The following week, we didn't have VAR against Spurs, there was a 5 minute delay over a penalty decision, accusations made left right and centre, and a very bad atmosphere as a result.
It took this club over 100 years just to install a basic scoreboard. When it was finally put in, I don't think it hurt anyone. Getting a screen in, is to let fans know when we have to use VAR, not leaving them in the dark. Even before it comes in, most clubs already have a screen in their ground. It's not exactly the splitting of the atom.